[Allison K]

I'll probably use number 5

1 2 3
4 5 6
7 8 9

with my drive team because in the box the goals are always in the same orientation, but as a general universal designation I think Number 8 (using red and blue endzones as a base) makes the most sense because right/left, top/bottom will change depending on where a person is standing, should you happen to be talking about the goals when not in the box.